[PATCH v5 03/10] gna: read hardware info

[Maciej Kwapulinski <maciej.kwapulinski@xxxxxxxxxxxxxxx>]

From: Tomasz Jankowski <tomasz1.jankowski@xxxxxxxxx>

Get the hardware information from register MMIO_IBUFFS

Signed-off-by: Tomasz Jankowski <tomasz1.jankowski@xxxxxxxxx>
Tested-by: Mikolaj Grzybowski <mikolajx.grzybowski@xxxxxxxxx>
Co-developed-by: Jianxun Zhang <jianxun.zhang@xxxxxxxxxxxxxxx>
Signed-off-by: Jianxun Zhang <jianxun.zhang@xxxxxxxxxxxxxxx>
Co-developed-by: Maciej Kwapulinski <maciej.kwapulinski@xxxxxxxxxxxxxxx>
Signed-off-by: Maciej Kwapulinski <maciej.kwapulinski@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/gna/gna_device.c | 4 ++++
 drivers/gpu/drm/gna/gna_device.h | 9 +++++++++
 drivers/gpu/drm/gna/gna_hw.h     | 7 +++++++
 3 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/gna/gna_device.c b/drivers/gpu/drm/gna/gna_device.c
index b8620b7da205..1f357221a603 100644
--- a/drivers/gpu/drm/gna/gna_device.c
+++ b/drivers/gpu/drm/gna/gna_device.c
@@ -42,6 +42,7 @@ int gna_probe(struct device *parent, struct gna_dev_info *dev_info, void __iomem
 {
 	struct gna_device *gna_priv;
 	struct drm_device *drm_dev;
+	u32 bld_reg;
 	int err;
 
 	gna_priv = devm_drm_dev_alloc(parent, &gna_drm_driver, struct gna_device, drm);
@@ -59,6 +60,9 @@ int gna_probe(struct device *parent, struct gna_dev_info *dev_info, void __iomem
 			return err;
 	}
 
+	bld_reg = gna_reg_read(gna_priv, GNA_MMIO_IBUFFS);
+	gna_priv->hw_info.in_buf_s = bld_reg & GENMASK(7, 0);
+
 	dev_set_drvdata(parent, drm_dev);
 
 	err = gna_drm_dev_init(drm_dev);
diff --git a/drivers/gpu/drm/gna/gna_device.h b/drivers/gpu/drm/gna/gna_device.h
index d269f7da5c5e..e42f167b62a0 100644
--- a/drivers/gpu/drm/gna/gna_device.h
+++ b/drivers/gpu/drm/gna/gna_device.h
@@ -6,6 +6,9 @@
 
 #include <drm/drm_device.h>
 
+#include <linux/io.h>
+#include <linux/types.h>
+
 #include "gna_hw.h"
 
 #define DRIVER_NAME		"gna"
@@ -24,7 +27,13 @@ struct gna_device {
 	/* device related resources */
 	void __iomem *iobase;
 	struct gna_dev_info info;
+	struct gna_hw_info hw_info;
 };
 
 int gna_probe(struct device *parent, struct gna_dev_info *dev_info, void __iomem *iobase);
+static inline u32 gna_reg_read(struct gna_device *gna_priv, u32 reg)
+{
+	return readl(gna_priv->iobase + reg);
+}
+
 #endif /* __GNA_DEVICE_H__ */
diff --git a/drivers/gpu/drm/gna/gna_hw.h b/drivers/gpu/drm/gna/gna_hw.h
index 3ca801096fd1..e858b76606fc 100644
--- a/drivers/gpu/drm/gna/gna_hw.h
+++ b/drivers/gpu/drm/gna/gna_hw.h
@@ -6,6 +6,13 @@
 
 #include <linux/mm_types.h>
 
+/* GNA MMIO registers */
+#define GNA_MMIO_IBUFFS		0xB4
+
+struct gna_hw_info {
+	u8 in_buf_s;
+};
+
 struct gna_dev_info {
 	u32 hwid;
 	u32 num_pagetables;
-- 
2.25.1